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A preparation method of an alloy material with high content of cobalt/antimony used for cathodes of lithium iron batteries

A lithium-ion battery, high specific capacity technology, applied in the field of lithium-ion batteries, can solve the problems of large specific surface area of ​​products, increased irreversible capacity, complicated process, etc., achieve low raw material cost, improve cycle stability, and simple process Effect

Inactive Publication Date: 2009-03-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CoSb synthesized by this method 2 The particle size is less than 20nm, and the uniformity is good, but the product has a large specific surface area, which is prone to agglomeration and surface oxidation, resulting in an increase in the irreversible capacity for the first time (up to about 600mAh / g), and the cost of raw materials is high, the process is complicated, and the yield is low. Low
In addition, the liquid-phase chemical reduction method is also used, and the literature (J.Xie, X.B.Zhao, G.S.Cao, M.J.Zhao, S.F.Su.Journal of Power Sources, 2005, 140:350-354) has produced CoSb with better cycle performance. 3 Alloy anode materials, the first irreversible capacity is only 257mAh / g, the first reversible capacity is 521mAh / g, and it remains at 460mAh / g in the 10th cycle, indicating that Co / Sb materials can indeed become a good class of alloy anode candidate materials, but This method still cannot avoid the disadvantages of high raw material cost, complicated process and low yield

Method used

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  • A preparation method of an alloy material with high content of cobalt/antimony used for cathodes of lithium iron batteries
  • A preparation method of an alloy material with high content of cobalt/antimony used for cathodes of lithium iron batteries
  • A preparation method of an alloy material with high content of cobalt/antimony used for cathodes of lithium iron batteries

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Experimental program
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Effect test

Embodiment 1

[0021] With Co 3 o 4 (≥98.5%), Sb 2 o 3 (≥99.0%) and activated carbon (>99.0%) are the initial raw materials, and the molar ratio is 2:9:35 (the atomic ratio of Co and Sb is 1:3), and the mixture is ball milled and mixed evenly. Raise the temperature to 850°C at a rate of 2°C / min under a flowing argon atmosphere, keep it warm for 2 hours, then turn off the power, and cool down to room temperature naturally. The XRD phase analysis results of the obtained sample showed that the synthesized product was CoSb 3 And a small amount of Sb, no other oxide impurity phase exists.

[0022]Add 10wt% conductive agent acetylene black and 10wt% binder PVDF to the synthesized material to make a slurry, evenly spread it on the copper foil, stick it into a circular pole piece after drying, and form an experimental battery with metal lithium for constant For current charge and discharge experiments, the charge and discharge current is 100mA / g, and the charge and discharge voltage range is co...

Embodiment 2

[0024] With CoO(≥98.5%), Sb 2 o 3 (≥99.0%) and activated carbon (>99.0%) are the initial raw materials, and the molar ratio is 2:1:5 (the atomic ratio of Co and Sb is 1:1), and the mixture is ball milled and mixed evenly. Under a flowing argon atmosphere, raise the temperature to 1000°C at a rate of 5°C / min, keep it warm for 1 hour, then turn off the power, and cool down to room temperature naturally. The XRD phase analysis results of the obtained sample showed that the synthesized product was CoSb. Add 10wt% conductive agent acetylene black and 10wt% binder PVDF to the synthesized material to make a slurry, evenly spread it on the copper foil, stick it into a circular pole piece after drying, and form an experimental battery with metal lithium for constant For current charge and discharge experiments, the charge and discharge current is 100mA / g, and the charge and discharge voltage range is controlled between 0.1-1.5V. The first irreversible capacity of the prepared CoSb a...

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Abstract

A making method of alloy lithium ion battery cathode material with high content Co / Sb, belongs to lithium ion battery field. Measuring and mating rate of oxide of the cobalt and the antimony by the proportion of Co and Sb in the generated alloy compounds, then adding the proper activated carbon or carbon black as reducing agent, the formed mixture after mixing evenly is provided in the flowing argon gas, nitrogen gas or under the aura of nitrogen gas and argon gas containing 5-10 vol% H2, by rate of heat rise of 2-30 DEG C to achieve required temperature of 750-1000 DEG C, heating for 1-6 hours, then controlling temperature by procedure and cooling or cooling with furnace to room temperature. The advantages of the invention is in that: not only with low material cost and simple process, less consume time and high yield, and the composite Co / Sb alloy particle is even and weensy, with high crystallinity, producing crystallinity cathode material with high specific capacity and stable circulation performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular provides a preparation method for a cobalt / antimony alloy material used for negative electrodes of lithium ion batteries. Background technique [0002] Mobile communications, laptop computers and digital cameras are the three fastest-growing industries in the global electronic information industry. With the rapid development of these industries, lithium-ion batteries, one of the most important accessories of these three leading products, are undoubtedly It has also become a very promising sunrise industry. Compared with traditional Ni / Cd and Ni / MH batteries, lithium-ion batteries have the advantages of high energy density, high working voltage, good load characteristics, fast charging speed, safety and pollution-free, and are currently the fastest growing and brightest market prospect A secondary battery. [0003] Lithium transition metal oxide / graphite system is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/20
Inventor 赵海雷王梦微郭洪仇卫华贾喜娣
Owner UNIV OF SCI & TECH BEIJING